Acoustic coupler



1. Acoustic coupler

FIG. 1.1 is a top, front and left side perspective view of the acoustic coupler showing my new design;

FIG. 1.2 is a left side elevation view thereof;

FIG. 1.3 is a right side elevation view thereof;

FIG. 1.4 is a front elevation view thereof;

FIG. 1.5 is a rear elevation view thereof;

FIG. 1.6 is a top plan view thereof; and

FIG. 1.7 is a bottom plan view thereof.

The broken lines in the drawings show portions of the acoustic coupler that form no part of the claimed design. 

CLAIM The ornamental design for an acoustic coupler, as shown and described. 